Astronomers have spotted a "rogue planet" - wandering the cosmos without a star to orbit - 100 light-years away. ...

So... 400 deg C on the 'surface' and wandering in line with a cluster of stars...

I'd put that in the category of a warm "Big Jupiter", perhaps still cooling down from coalescing.

I expect there are wandering free bodies such as comets, asteroids and planets, that have been ejected from their home star system. However, I don't see how we can see to find them with our present capabilities... They have no star to illuminate them!

Perhaps the SKA has a chance to see cold lost wandering planets at radio frequencies for their cool emissions? Or will they be far too cold and lost in the noise?

Keep searchin',
Martin
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Astronomers have spotted a "rogue planet" - wandering the cosmos without a star to orbit - 100 light-years away. ...

So... 400 deg C on the 'surface' and wandering in line with a cluster of stars...

I'd put that in the category of a warm "Big Jupiter", perhaps still cooling down from coalescing.

I expect there are wandering free bodies such as comets, asteroids and planets, that have been ejected from their home star system. However, I don't see how we can see to find them with our present capabilities... They have no star to illuminate them!

Perhaps the SKA has a chance to see cold lost wandering planets at radio frequencies for their cool emissions? Or will they be far too cold and lost in the noise?

Keep searchin',
Martin

Huge find! Looks like there are wandering nomads out there. First glance I thought they found the (hypothetical planet) Tyche.
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The universe wastes nothing, it's simply transferred.